vpn/plugins/openvpn.c

   1 /*
   2  *
   3  *  ConnMan VPN daemon
   4  *
   5  *  Copyright (C) 2010  BMW Car IT GmbH. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <errno.h>
  29 #include <unistd.h>
  30 #include <stdio.h>
  31 #include <net/if.h>
  32
  33 #include <glib.h>
  34
  35 #define CONNMAN_API_SUBJECT_TO_CHANGE
  36 #include <connman/plugin.h>
  37 #include <connman/log.h>
  38 #include <connman/task.h>
  39 #include <connman/dbus.h>
  40 #include <connman/ipconfig.h>
  41
  42 #include "../vpn-provider.h"
  43
  44 #include "vpn.h"
  45
  46 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
  47
  48 static DBusConnection *connection;
  49
  50 struct {
  51         const char *cm_opt;
  52         const char *ov_opt;
  53         char       has_value;
  54 } ov_options[] = {
  55         { "Host", "--remote", 1 },
  56         { "OpenVPN.CACert", "--ca", 1 },
  57         { "OpenVPN.Cert", "--cert", 1 },
  58         { "OpenVPN.Key", "--key", 1 },
  59         { "OpenVPN.MTU", "--mtu", 1 },
  60         { "OpenVPN.NSCertType", "--ns-cert-type", 1 },
  61         { "OpenVPN.Proto", "--proto", 1 },
  62         { "OpenVPN.Port", "--port", 1 },
  63         { "OpenVPN.AuthUserPass", "--auth-user-pass", 1 },
  64         { "OpenVPN.AskPass", "--askpass", 1 },
  65         { "OpenVPN.AuthNoCache", "--auth-nocache", 0 },
  66         { "OpenVPN.TLSRemote", "--tls-remote", 1 },
  67         { "OpenVPN.TLSAuth", NULL, 1 },
  68         { "OpenVPN.TLSAuthDir", NULL, 1 },
  69         { "OpenVPN.Cipher", "--cipher", 1 },
  70         { "OpenVPN.Auth", "--auth", 1 },
  71         { "OpenVPN.CompLZO", "--comp-lzo", 0 },
  72         { "OpenVPN.RemoteCertTls", "--remote-cert-tls", 1 },
  73         { "OpenVPN.ConfigFile", "--config", 1 },
  74 };
  75
  76 struct nameserver_entry {
  77         int id;
  78         char *nameserver;
  79 };
  80
  81 static struct nameserver_entry *ov_append_dns_entries(const char *key,
  82                                                 const char *value)
  83 {
  84         struct nameserver_entry *entry = NULL;
  85         gchar **options;
  86
  87         if (g_str_has_prefix(key, "foreign_option_") == FALSE)
  88                 return NULL;
  89
  90         options = g_strsplit(value, " ", 3);
  91         if (options[0] != NULL &&
  92                 !strcmp(options[0], "dhcp-option") &&
  93                         options[1] != NULL &&
  94                         !strcmp(options[1], "DNS") &&
  95                                 options[2] != NULL) {
  96
  97                 entry = g_try_new(struct nameserver_entry, 1);
  98                 if (entry == NULL)
  99                         return NULL;
 100
 101                 entry->nameserver = g_strdup(options[2]);
 102                 entry->id = atoi(key + 15); /* foreign_option_XXX */
 103         }
 104
 105         g_strfreev(options);
 106
 107         return entry;
 108 }
 109
 110 static char *ov_get_domain_name(const char *key, const char *value)
 111 {
 112         gchar **options;
 113         char *domain = NULL;
 114
 115         if (g_str_has_prefix(key, "foreign_option_") == FALSE)
 116                 return NULL;
 117
 118         options = g_strsplit(value, " ", 3);
 119         if (options[0] != NULL &&
 120                 !strcmp(options[0], "dhcp-option") &&
 121                         options[1] != NULL &&
 122                         !strcmp(options[1], "DOMAIN") &&
 123                                 options[2] != NULL) {
 124
 125                 domain = g_strdup(options[2]);
 126         }
 127
 128         g_strfreev(options);
 129
 130         return domain;
 131 }
 132
 133 static gint cmp_ns(gconstpointer a, gconstpointer b)
 134 {
 135         struct nameserver_entry *entry_a = (struct nameserver_entry *)a;
 136         struct nameserver_entry *entry_b = (struct nameserver_entry *)b;
 137
 138         if (entry_a->id < entry_b->id)
 139                 return -1;
 140
 141         if (entry_a->id > entry_b->id)
 142                 return 1;
 143
 144         return 0;
 145 }
 146
 147 static void free_ns_entry(gpointer data)
 148 {
 149         struct nameserver_entry *entry = data;
 150
 151         g_free(entry->nameserver);
 152         g_free(entry);
 153 }
 154
 155 static int ov_notify(DBusMessage *msg, struct vpn_provider *provider)
 156 {
 157         DBusMessageIter iter, dict;
 158         const char *reason, *key, *value;
 159         char *address = NULL, *gateway = NULL, *peer = NULL;
 160         struct connman_ipaddress *ipaddress;
 161         GSList *nameserver_list = NULL;
 162
 163         dbus_message_iter_init(msg, &iter);
 164
 165         dbus_message_iter_get_basic(&iter, &reason);
 166         dbus_message_iter_next(&iter);
 167
 168         if (!provider) {
 169                 connman_error("No provider found");
 170                 return VPN_STATE_FAILURE;
 171         }
 172
 173         if (strcmp(reason, "up"))
 174                 return VPN_STATE_DISCONNECT;
 175
 176         dbus_message_iter_recurse(&iter, &dict);
 177
 178         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 179                 struct nameserver_entry *ns_entry = NULL;
 180                 DBusMessageIter entry;
 181
 182                 dbus_message_iter_recurse(&dict, &entry);
 183                 dbus_message_iter_get_basic(&entry, &key);
 184                 dbus_message_iter_next(&entry);
 185                 dbus_message_iter_get_basic(&entry, &value);
 186
 187                 DBG("%s = %s", key, value);
 188
 189                 if (!strcmp(key, "trusted_ip")) {
 190                         vpn_provider_set_string(provider, "Gateway", value);
 191                         gateway = g_strdup(value);
 192                 }
 193
 194                 if (!strcmp(key, "ifconfig_local")) {
 195                         vpn_provider_set_string(provider, "Address", value);
 196                         address = g_strdup(value);
 197                 }
 198
 199                 if (!strcmp(key, "ifconfig_remote")) {
 200                         vpn_provider_set_string(provider, "Peer", value);
 201                         peer = g_strdup(value);
 202                 }
 203
 204                 if (g_str_has_prefix(key, "route_") == TRUE)
 205                         vpn_provider_append_route(provider, key, value);
 206
 207                 if ((ns_entry = ov_append_dns_entries(key, value)) != NULL)
 208                         nameserver_list = g_slist_prepend(nameserver_list,
 209                                                         ns_entry);
 210                 else {
 211                         char *domain = ov_get_domain_name(key, value);
 212                         if (domain != NULL) {
 213                                 vpn_provider_set_domain(provider, domain);
 214                                 g_free(domain);
 215                         }
 216                 }
 217
 218                 dbus_message_iter_next(&dict);
 219         }
 220
 221         ipaddress = connman_ipaddress_alloc(AF_INET);
 222         if (ipaddress == NULL) {
 223                 g_slist_free_full(nameserver_list, free_ns_entry);
 224                 g_free(address);
 225                 g_free(gateway);
 226                 g_free(peer);
 227
 228                 return VPN_STATE_FAILURE;
 229         }
 230
 231         connman_ipaddress_set_ipv4(ipaddress, address, NULL, gateway);
 232         connman_ipaddress_set_peer(ipaddress, peer);
 233         vpn_provider_set_ipaddress(provider, ipaddress);
 234
 235         if (nameserver_list != NULL) {
 236                 char *nameservers = NULL;
 237                 GSList *tmp;
 238
 239                 nameserver_list = g_slist_sort(nameserver_list, cmp_ns);
 240                 for (tmp = nameserver_list; tmp != NULL;
 241                                                 tmp = g_slist_next(tmp)) {
 242                         struct nameserver_entry *ns = tmp->data;
 243
 244                         if (nameservers == NULL) {
 245                                 nameservers = g_strdup(ns->nameserver);
 246                         } else {
 247                                 char *str;
 248                                 str = g_strjoin(" ", nameservers,
 249                                                 ns->nameserver, NULL);
 250                                 g_free(nameservers);
 251                                 nameservers = str;
 252                         }
 253                 }
 254
 255                 g_slist_free_full(nameserver_list, free_ns_entry);
 256
 257                 vpn_provider_set_nameservers(provider, nameservers);
 258
 259                 g_free(nameservers);
 260         }
 261
 262         g_free(address);
 263         g_free(gateway);
 264         g_free(peer);
 265         connman_ipaddress_free(ipaddress);
 266
 267         return VPN_STATE_CONNECT;
 268 }
 269
 270 static int ov_save(struct vpn_provider *provider, GKeyFile *keyfile)
 271 {
 272         const char *option;
 273         int i;
 274
 275         for (i = 0; i < (int)ARRAY_SIZE(ov_options); i++) {
 276                 if (strncmp(ov_options[i].cm_opt, "OpenVPN.", 8) == 0) {
 277                         option = vpn_provider_get_string(provider,
 278                                                         ov_options[i].cm_opt);
 279                         if (option == NULL)
 280                                 continue;
 281
 282                         g_key_file_set_string(keyfile,
 283                                         vpn_provider_get_save_group(provider),
 284                                         ov_options[i].cm_opt, option);
 285                 }
 286         }
 287         return 0;
 288 }
 289
 290 static int task_append_config_data(struct vpn_provider *provider,
 291                                         struct connman_task *task)
 292 {
 293         const char *option;
 294         int i;
 295
 296         for (i = 0; i < (int)ARRAY_SIZE(ov_options); i++) {
 297                 if (ov_options[i].ov_opt == NULL)
 298                         continue;
 299
 300                 option = vpn_provider_get_string(provider,
 301                                         ov_options[i].cm_opt);
 302                 if (option == NULL)
 303                         continue;
 304
 305                 if (connman_task_add_argument(task,
 306                                 ov_options[i].ov_opt,
 307                                 ov_options[i].has_value ? option : NULL) < 0) {
 308                         return -EIO;
 309                 }
 310         }
 311
 312         return 0;
 313 }
 314
 315 static int ov_connect(struct vpn_provider *provider,
 316                         struct connman_task *task, const char *if_name,
 317                         vpn_provider_connect_cb_t cb, void *user_data)
 318 {
 319         const char *option;
 320         int err = 0, fd;
 321
 322         option = vpn_provider_get_string(provider, "Host");
 323         if (option == NULL) {
 324                 connman_error("Host not set; cannot enable VPN");
 325                 return -EINVAL;
 326         }
 327
 328         task_append_config_data(provider, task);
 329
 330         option = vpn_provider_get_string(provider, "OpenVPN.ConfigFile");
 331         if (option == NULL) {
 332                 /*
 333                  * Set some default options if user has no config file.
 334                  */
 335                 option = vpn_provider_get_string(provider, "OpenVPN.TLSAuth");
 336                 if (option != NULL) {
 337                         connman_task_add_argument(task, "--tls-auth", option);
 338                         option = vpn_provider_get_string(provider,
 339                                                         "OpenVPN.TLSAuthDir");
 340                         if (option != NULL)
 341                                 connman_task_add_argument(task, option, NULL);
 342                 }
 343
 344                 connman_task_add_argument(task, "--nobind", NULL);
 345                 connman_task_add_argument(task, "--persist-key", NULL);
 346                 connman_task_add_argument(task, "--client", NULL);
 347         }
 348
 349         connman_task_add_argument(task, "--syslog", NULL);
 350
 351         connman_task_add_argument(task, "--script-security", "2");
 352
 353         connman_task_add_argument(task, "--up",
 354                                         SCRIPTDIR "/openvpn-script");
 355         connman_task_add_argument(task, "--up-restart", NULL);
 356
 357         connman_task_add_argument(task, "--setenv", NULL);
 358         connman_task_add_argument(task, "CONNMAN_BUSNAME",
 359                                         dbus_bus_get_unique_name(connection));
 360
 361         connman_task_add_argument(task, "--setenv", NULL);
 362         connman_task_add_argument(task, "CONNMAN_INTERFACE",
 363                                         CONNMAN_TASK_INTERFACE);
 364
 365         connman_task_add_argument(task, "--setenv", NULL);
 366         connman_task_add_argument(task, "CONNMAN_PATH",
 367                                         connman_task_get_path(task));
 368
 369         connman_task_add_argument(task, "--dev", if_name);
 370         connman_task_add_argument(task, "--dev-type", "tun");
 371
 372         connman_task_add_argument(task, "--persist-tun", NULL);
 373
 374         connman_task_add_argument(task, "--route-noexec", NULL);
 375         connman_task_add_argument(task, "--ifconfig-noexec", NULL);
 376
 377         /*
 378          * Disable client restarts because we can't handle this at the
 379          * moment. The problem is that when OpenVPN decides to switch
 380          * from CONNECTED state to RECONNECTING and then to RESOLVE,
 381          * it is not possible to do a DNS lookup. The DNS server is
 382          * not accessable through the tunnel anymore and so we end up
 383          * trying to resolve the OpenVPN servers address.
 384          */
 385         connman_task_add_argument(task, "--ping-restart", "0");
 386
 387         fd = fileno(stderr);
 388         err = connman_task_run(task, vpn_died, provider,
 389                         NULL, &fd, &fd);
 390         if (err < 0) {
 391                 connman_error("openvpn failed to start");
 392                 err = -EIO;
 393                 goto done;
 394         }
 395
 396 done:
 397         if (cb != NULL)
 398                 cb(provider, user_data, err);
 399
 400         return err;
 401 }
 402
 403 static struct vpn_driver vpn_driver = {
 404         .notify = ov_notify,
 405         .connect        = ov_connect,
 406         .save           = ov_save,
 407 };
 408
 409 static int openvpn_init(void)
 410 {
 411         connection = connman_dbus_get_connection();
 412
 413         return vpn_register("openvpn", &vpn_driver, OPENVPN);
 414 }
 415
 416 static void openvpn_exit(void)
 417 {
 418         vpn_unregister("openvpn");
 419
 420         dbus_connection_unref(connection);
 421 }
 422
 423 CONNMAN_PLUGIN_DEFINE(openvpn, "OpenVPN plugin", VERSION,
 424         CONNMAN_PLUGIN_PRIORITY_DEFAULT, openvpn_init, openvpn_exit)